EM65570
68COM/ 98SEG 65K Color STN LCD Driver
8.2.17 Internal Register Read Address
D7 D6 D5 D4 D3 D2 D1 D0
RA3 RA2 RA1 RA0
CSB RS RDB WRB RE2 RE1 RE0
0
1
1
1
0
1
1
0
0
0
1
(At the time of reset: {RA3, RA2, RA1, RA0} = 7H)
Use the RA register to specify the address for the register read operation. The
EM65570 has many registers and register banks. Therefore, a 4-step operation is
required to read the specific register.
1) Write 01H to the RE register for accessing the RA register
2) Write specific register address to the RA register
3) Write the specific register bank to the RE register
4) Read specific contents
8.2.18 Resistance Ratio of CR Oscillator
D7 D6 D5 D4 D3 D2 D1 D0
RF3 RF2 RF1 RF0
CSB RS RDB WRB RE2 RE1 RE0
1
0
0
0
0
1
1
0
0
0
1
(At the time of reset: {RF3, RF2, RF1, RF0} = 0H, read address: 8H)
The RF registers control the resistance ratio of the CR oscillator. Therefore, the frame
frequency will change the RF register settings.
When changing the RF register values, you need to check the LCD display quality.
RF3
0
RF2
0
RF1
0
RF0
0
Operation
Initial Resistance Ratio
0
0
0
1
0.72 times of initial Resistance Ratio
0.76 times of initial Resistance Ratio
0.8 times of initial Resistance Ratio
0.84 times of initial Resistance Ratio
0.88 times of initial Resistance Ratio
0.92 times of initial Resistance Ratio
0.96 times of initial Resistance Ratio
1.04 times of initial Resistance Ratio
1.08 times of initial Resistance Ratio
1.12 times of initial Resistance Ratio
1.16 times of initial Resistance Ratio
1.2 times of initial Resistance Ratio
1.24 times of initial Resistance Ratio
1.28 times of initial Resistance Ratio
Prohibit Code
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
1
0
0
1
1
0
0
1
1
1
0
1
0
1
0
1
0
1
72 •
Product Specification (V1.0) 09.05.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
